<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<style>
  body{
    background-size: 100% 100%;
    background: url(../img/星空.jpg) no-repeat fixed;
  }

  #head{
    border: 0px;
    width: 400px;
    height: 250px;
    background: transparent;
    padding-left: 100px;
    padding-top: 80px;
    margin-left: 600px;
    margin-top: 250px;
  }

  input{
    width: 280px;
    height: 30px;
    color: darkgray;
  }

  #tb{
    height: 150px;
  }

  #bt{
    background: #539bf6;
    color: aliceblue;
    border: aliceblue;
  }
</style>

<body>
    <div id="head">
        <form id="iForm">
          <table id="tb">
            <tr>
              <td><input type="text" value="账号"><br>
              </td>
            </tr>
            <tr>
              <td>
                <input type="text" value="密码"><br>
              </td>
            </tr>
            <tr>
              <td>
                <input id="bt" type="button" value="登录">
              </td>
            </tr>
          </table>
        </form>
    </div>


</body>
</html>